//==========================================================================
// Copyright (c) 2000-2008,  Elastos, Inc.  All Rights Reserved.
//==========================================================================
/*
;***
;llshl.asm - long shift left
;
;       Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
;
;Purpose:
;   define long shift left routine (signed and unsigned are same)
;       __allshl
;******************************************************************************

;***
;llshl - long shift left
;
;Purpose:
;   Does a Long Shift Left (signed and unsigned are identical)
;   Shifts a long left any number of bits.
;
;Entry:
;   EDX:EAX - long value to be shifted
;   CL    - number of bits to shift by
;
;Exit:
;   EDX:EAX - shifted value
;
;Uses:
;   CL is destroyed.
;
;Exceptions:
;
;*****************************************************************************/

//==========================================================================
// Copyright (c) 2000-2004,  Elastos, Inc.  All Rights Reserved.
//==========================================================================
//
// The original program was copied from Microsoft Visual Studio 6.0
// Enterprise Edition.  This file is adapted for Zee operating system.
//==========================================================================

#include <elatypes.h>

__declspec(naked) void __cdecl _allshl(void)
{
    __asm {
;
; Handle shifts of 64 or more bits (all get 0)
;
    cmp cl, 64
    jae short RETZERO

;
; Handle shifts of between 0 and 31 bits
;
    cmp cl, 32
    jae short MORE32
    shld    edx,eax,cl
    shl eax,cl
    ret

;
; Handle shifts of between 32 and 63 bits
;
MORE32:
    mov edx,eax
    xor eax,eax
    and cl,31
    shl edx,cl
    ret

;
; return 0 in edx:eax
;
RETZERO:
    xor eax,eax
    xor edx,edx
    ret
    }
}
